Things imported from a third country, such as China, sort of cost more. PPP is strongly affected by the cost of locally grown potatoes, locally made milk, local

Things imported from a third country, such as China, sort of cost more. PPP is strongly affected by the cost of locally grown potatoes, locally made milk, locally performed plumbing repairts. PPP is about adjusting exchange rates to keep "cost of one plumber hour" fixed across several countries, the cost of buying USB sticks made in China is kind of then "more expensive" in a country where the cost of getting a plumber of otherwise "low", with both "more expensive" and "low" a matter of definition. Both plumbers' rates and USB sticks flow into the calculations, of course. The previous paragraph is simplified.